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首页> 外文期刊>Energy Policy >More caution is needed when using life cycle assessment to determine energy return on investment (EROI)
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More caution is needed when using life cycle assessment to determine energy return on investment (EROI)

机译：在使用生命周期评估来确定能源投资回报率（EROI）时，需要更加谨慎

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摘要

Cumulative energy demand (CED) estimates from life cycle assessments (LCAs) are increasingly used to determine energy return on investment (EROI), but the difference in indicators can lead to a misclassification of energy flows in the assessment. The core idea of EROI is to measure the relation of energy diverted from society to make energy available to society. CED, on the other hand, includes forms of energy that are not appropriated by society, such as fugitive methane emissions from oil wells as well as losses of heating value of coal during transport and storage. Such energy forms should be excluded from EROI; failure to do so leads to results that are inconsistent with the intention of EROI and potentially misleading. We demonstrate how this problem is at least partially rectifiable by adopting consistent energy accounting, but also note that among the energy flows not appropriated by society occurring in CED, not all flows can easily be removed. Further, we point to inconsistencies in heating value assumptions in a widely used database that have misled analysts. Finally, we argue that the differential weighting of primary energy forms in published CED-based EROI work is unsubstantiated and should be reconsidered. (C) 2014 Elsevier Ltd. All rights reserved.
机译：生命周期评估（LCA）中的累积能源需求（CED）估计越来越多地用于确定能源投资回报率（EROI），但是指标的差异可能导致评估中的能源流分类错误。 EROI的核心思想是衡量从社会转移来的能量向社会提供的能源之间的关系。另一方面，CED包括社会不适合使用的能源形式，例如油井中散逸的甲烷排放以及运输和存储过程中煤炭热值的损失。这种能量形式应从EROI中排除；否则会导致结果与EROI的意图不一致并可能产生误导。我们通过采用一致的能源核算方法证明了该问题至少可以部分纠正，但同时请注意，在CED中，社会无法适当利用的能源流量中，并非所有流量都可以轻松消除。此外，我们指出了广泛使用的数据库中的发热量假设的不一致之处，这些数据误导了分析人员。最后，我们认为在已发表的基于CED的EROI工作中，一次能源形式的差异加权是没有根据的，应该重新考虑。 （C）2014 Elsevier Ltd.保留所有权利。

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